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English definition of “paranoia”

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paranoia

noun uk   /ˌpær.əˈnɔɪ.ə/ us    /ˌper-/
[C or U] an extreme and unreasonable feeling that other people do not like you or are going to harm or criticize you: There's a lot of paranoia about crime at the moment. [U] specialized psychology Someone who has paranoia has unreasonable false beliefs as a part of another mental illness, for example schizophrenia .
(Definition of paranoia from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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